Scotland Yard's most senior anti-terror officer Mark Rowley said one policeman, two civilians and the attacker died, including a woman hit by the attacker's car before he reached Parliament. She was confirmed dead by a doctor at St Thomas' Hospital.

The unarmed police officer who was killed inside the gates of Parliament was named as Pc Keith Palmer, a 48-year-old husband and father.

The other civilian killed was a man in his 50s.

Pc Palmer had worked for the Metropolitan Police for 15 years, having previously served in the armed forces. 

"He was someone who left for work today expecting to return home at the end of his shift - and he had every right to expect that would happen,"

Mr Rowley said.

PC Keith Palmer was a member of the Metropolitan Police’s Parliamentary and Diplomatic Protection command.

He served as a member of the Royal Artillery before becoming a cop.

PC Palmer was also described as a loving a husband and father.